U.S. patent number 4,476,897 [Application Number 06/399,008] was granted by the patent office on 1984-10-16 for flowline connector seal.
This patent grant is currently assigned to Smith International, Inc.. Invention is credited to Charles D. Morrill.
United States Patent |
4,476,897 |
Morrill |
October 16, 1984 |
**Please see images for:
( Certificate of Correction ) ** |
Flowline connector seal
Abstract
A flangeless, disc-like seal plate is disclosed for insertion
between opposing flowline hubs for sealingly connecting, blocking
or rerouting fluid flow between various fluid carrying lines within
said flowline hubs. For connecting flow lines, straight
throughbores within the seal plate are provided with V-seals in
channels on said seal plate around the throughbores, as well as
O-ring seals around said V-seals and another O-ring near the
periphery of the disc itself. No seals or seal grooves are
necessary on the hub faces. For connecting hydraulic control lines,
the seal plate is equipped with transverse channels interconnecting
various throughbores but may also be provided with blind ports for
totally blocking off certain control lines at the plate. Within
said throughbores, fluid diverter plugs are inserted which are
either equipped with protruding caps for opening up corresponding
check valves housed within hub lines or flush plugs such that said
check valves remain closed after clamp-up. Through this arrangement
various lines may either be blocked, be fluidly connected, or have
their fluid flow rerouted internally without rearranging the
alignment between the lines within the flowline bundle.
Inventors: |
Morrill; Charles D. (Bellaire,
TX) |
Assignee: |
Smith International, Inc.
(Newport Beach, CA)
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Family
ID: |
26777346 |
Appl.
No.: |
06/399,008 |
Filed: |
July 16, 1982 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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87747 |
Oct 24, 1979 |
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973895 |
Dec 28, 1978 |
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Current U.S.
Class: |
137/594; 137/271;
137/597; 137/614.03 |
Current CPC
Class: |
E21B
43/013 (20130101); F16L 37/002 (20130101); Y10T
137/87153 (20150401); Y10T 137/87249 (20150401); Y10T
137/87949 (20150401); Y10T 137/5283 (20150401) |
Current International
Class: |
E21B
43/00 (20060101); E21B 43/013 (20060101); F16L
37/00 (20060101); F16L 029/00 () |
Field of
Search: |
;166/341,342,343,344
;137/271,594,597,614,614.03,614.05,635,884 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Nilson; Robert G.
Attorney, Agent or Firm: Conley; Ned L. Rose; David A.
Shull; William E.
Parent Case Text
REFERENCE TO RELATED APPLICATIONS
This is a division of application Ser. No. 87,747, filed on Oct.
24, 1979 now abandoned, which is a continuation-in-part of U.S.
application Ser. No. 973,895 filed Dec. 28, 1978 and abandoned in
favor of application Ser. No. 283,094, filed July 13, 1981, now
U.S. Pat. No. 4,382,717.
Claims
What is claimed is:
1. A seal plate for sealingly engaging two opposing fluid line
hubs, the hubs each having at least one port with a fluid line
attached thereto and at least one of such ports having valve means
therein for closing off the corresponding fluid line,
comprising:
a flangeless disc-like metal body member insertable between such
hubs having a diameter larger than its thickness;
fluid communication means through said body member for providing
fluid communication between the fluid lines of such hubs;
means on each face of said body member for sealingly engaging each
one of the hubs; and
guidance means disposed in said fluid communication means
engageable with such valve means upon insertion of said body member
between such hubs for opening such valve means and permitting the
fluid flow through said fluid communication means.
2. The seal plate defined by claim 1 wherein said body member
includes transverse fluid communication means for providing fluid
communication between said fluid communication means; and
said guidance means including means for diverting fluid through
said fluid communication means into said transverse fluid
communication means.
3. The seal plate as defined by claim 1 wherein said guidance means
includes fins adjacent to and extending across the inlet and outlet
of said fluid communication means.
4. The seal plate as defined by claim 1 wherein said guidance means
includes a projection extending from each of said faces of said
body member for engagement with the valve means of the hubs.
5. The seal plate as defined by claim 4 wherein said projections
are removably housed within said fluid communication means by a set
of radially extending fins at the inlet and outlet of said fluid
communication means.
6. A connection for sealingly connecting fluid carrying pipes for
transporting liquids comprising:
two hubs aligned opposite one another each having at least one port
connected to at least one such fluid carrying pipe;
a seal plate disposed between said opposing hubs, said seal plate
having at least one throughbore interconnecting said ports;
means for joining together said opposing hubs with said seal plate
therebetween;
valve means housed within at least one of said ports for sealingly
closing off such fluid carrying pipes; and
fluid guidance means disposed within at least one of said
throughbores and engaging said valve means upon such joining of
said hubs for actuating said valve means and controlling the flow
of liquids between such opposite fluid carrying pipes.
7. The connection of claim 6 wherein said fluid guidance means
includes:
a pin substantially smaller in diameter than said throughbore;
a set of fins spaced on one end of said pin, said fins extending
radially away from said pin toward the walls of said throughbore;
and
a protruding cap on top of said pin end adapted for extension
beyond the surface of said seal plate for engaging said valve
means.
8. The connection of claim 7 wherein at least one of said pins
includes a seal plug on the end of said pin opposite the end having
said fins, said seal plug being substantially flush with the
surface of said seal plate.
9. The connection of claim 7 wherein at least one of said pins has
a length less than the thickness of said seal plate.
10. The connection of claim 6 wherein said seal plate includes
transverse bores interconnecting at least two of said
throughbores.
11. The connection of claim 6 wherein said joining means includes
two clamp halves straddling said hubs, said seal plate being
suspended between said clamp halves, and remotely operable means to
pull together said clamp halves.
12. A seal plate for sealingly engaging two opposing hubs having a
plurality of hydraulic lines therethrough, comprising:
a disc-like metal body member having flangeless faces and a
diameter substantially larger than its thickness;
at least a first and second bore through said body member, each of
said bores being in alignment with a different hydraulic line for
permitting fluid passage between the hubs;
a transverse bore in said body member extending between said first
and second bores for permitting fluid passage therebetween; and
fluid guidance members housed in said first and second bores for
guiding fluid flow through said body member, wherein said fluid
guidance members include a first stop plug for the inlet of said
first bore and a second stop plug for the outlet of said second
bore whereby fluid is channeled through the inlet of said second
bore, through said transverse bore and out the outlet of said first
bore.
13. The seal plate as defined by claim 12 wherein said fluid
guidance members include protrusions beyond the faces of said body
member for determining the passage of fluid through said first and
second bores and said transverse bore.
14. A seal plate for sealingly engaging two opposing hubs having a
plurality of hydraulic lines therethrough, comprising:
a disc-like metal body member having flangeless faces and a
diameter substantially larger than its thickness;
at least a first and second bore through said body member, each of
said bores being in alignment with a different hydraulic line for
permitting fluid passage between the hubs;
a transverse bore in said body member extending between said first
and second bores for permitting fluid passage therebetween; and
fluid guidance members housed in said first and second bores for
guiding fluid flow through said body member, wherein at least one
of said fluid guidance members includes
a center pin having one end protruding beyond a face of said body
member;
fins extending across a first opening in the corresponding one of
said first and second bores which abut a raised shoulder within a
groove around said corresponding one of said first and second
bores; and
a stop plug sealing off a second opening in said corresponding one
of said first and second bores at the other end of said center
pin.
15. The seal plate as defined by claim 14 and further including
sealing means around said stop plug for sealingly engaging said
body member.
16. A seal plate for sealingly engaging two opposing hubs having a
plurality of hydraulic lines therethrough, comprising:
a disc-like metal body member having flangeless faces and a
diameter substantially larger than its thickness;
at least a first and second bore through said body member, each of
said bores being in alignment with a different hydraulic line for
permitting fluid passage between the hubs;
a transverse bore in said body member extending between said first
and second bores for permitting fluid passage therebetween; and
fluid guidance members housed in said first and second bores for
guiding fluid flow through said body member, wherein said fluid
guidance members include means for preventing flow through the
outlets of said first and second bores for routing fluid flow from
the inlet of said first bore, through said transverse bore, and out
the inlet of said second bore.
17. A seal plate for sealingly engaging two opposing hubs having a
plurality of hydraulic lines therethrough, comprising:
a disc-like metal body member having flangeless faces and a
diameter substantially larger than its thickness;
at least a first and second bore through said body member, each of
said bores being in alignment with a different hydraulic line for
permitting fluid passage between the hubs;
a transverse bore in said body member extending between said first
and second bores for permitting fluid passage therebetween; and
fluid guidance members housed in said first and second bores for
guiding fluid flow through said body member, wherein one of said
fluid guidance members includes
a center pin having both ends protruding beyond the faces of said
body member; and
first and second fins extending across the inlet and outlet,
respectively, of the corresponding one of said first and second
bores.
18. The seal plate as defined by claim 17 wherein said first and
second fins abut first and second raised shoulders, respectively,
housed within first and second grooves, respectively,
circumscribing the inlet and outlet, respectively, of said
corresponding one of said first and second bores.
19. A seal plate for sealingly engaging two opposing hubs having a
plurality of hydraulic lines therethrough, comprising:
a disc-like metal body member having flangeless faces and a
diameter substantially larger than its thickness;
at least a first and second bore through said body member, each of
said bores being in alignment with a different hydraulic line for
permitting fluid passage between the hubs;
a transverse bore in said body member extending between said first
and second bores for permitting fluid passage therebetween;
fluid guidance members housed in said first and second bores for
guiding fluid flow through said body member;
a transverse channel within said body member communicating with one
of said bores;
a blind bore through one face of said body member but not extending
all the way through said body member, said blind bore communicating
with said transverse channel; and
a fluid channel in said body member extending from the periphery of
said body member to said blind bore whereby fluids can flow from
the periphery of said body member to said one of said bores.
20. The seal plate as defined by claim 19 and further including a
fluid guidance member housed within said blind bore.
21. The seal plate as defined by claim 20 wherein said fluid
guidance member includes:
a center pin having one end protruding from said blind bore and the
other end disposed in said body member; and
connector fins extending across the opening of said blind bore at
the face of said body member.
22. A seal plate for sealingly engaging two opposing hubs having a
plurality of hydraulic lines therethrough, comprising:
a disc-like metal body member having flangeless faces and a
diameter substantially larger than its thickness;
at least a first and second bore through said body member, each of
said bores being in alignment with a different hydraulic line for
permitting fluid passage between the hubs;
a transverse bore in said body member extending between said first
and second bores for permitting fluid passage therebetween;
fluid guidance members housed in said first and second bores for
guiding fluid flow through said body member, and
a blind port in said body member for sealing off from fluid flow
one of the hydraulic lines.
23. The seal plate as defined by claim 22 wherein said bline port
includes a pressure tap.
24. A seal plate for sealingly engaging two opposing hubs having a
plurality of hydraulic lines therethrough, comprising:
a disc-like metal body member having flangeless faces and a
diameter substantially larger than its thickness;
a plurality of hydraulic line bores through said body member, one
of said hydraulic line bores being in alignment with each of the
hydraulic lines for providing fluid communication therebetween;
first annular grooves disposed in each face of said body member and
circumscribing the inlet and outlet of said hydraulic line
bores;
metal sealing members housed in said first annular grooves for
sealingly engaging the hubs and said body member;
at least two alignment bores extending through said body
member;
second annular grooves disposed in each face of said body member
and passing through said first annular grooves adjacent the
outermost side of said metal sealing members;
third annular grooves disposed at the periphery and in each face of
said body member and circumscribing all of said hydraulic line
bores;
elastomeric sealing members housed in said third annular grooves
for sealingly engaging the hubs and said body member;
a test port communicating with said second annular grooves for
transmitting test fluids to said first annular grooves to test said
metal sealing members; and
a fluid guidance plug housed within at least one of said hydraulic
line bores for controlling the passage of fluid therethrough.
25. The seal plate as defined by claim 24 and further including an
arcuate channel in the periphery of said body member for housing a
portion of said test port.
26. The seal plate as defined by claim 24 wherein said metal
sealing members include metal annular seal rings having a V-shaped
cross section, the apex of said V-shape engaging the hubs and the
legs of said V-shape engaging said body member; and including
diametrically opposed channels extending from the bottom of one of
said first annular grooves at the inner periphery thereof to the
corresponding one of said hydraulic line bores for permitting fluid
flow underneath said annular metal seal ring in said one of said
first annular grooves from said corresponding hydraulic line
bore.
27. The seal plate as defined by claim 24 wherein said metal
sealing members include metal annular seal rings having a V-shaped
cross section with the legs of said V-shape engaging the bottom of
said first annular grooves, said first annular grooves having a
raised annular shoulder circumscribing said hydraulic line bores
making line contact with the innermost leg of said metal annular
seal rings.
28. The seal plate as defined by claim 27 wherein said fluid
guidance plug has fins adjacent to and extending across the inlet
and outlet of said one of said hydraulic line bores and in
engagement with said annular shoulders of said first annular
grooves of said one of said hydraulic line bores.
29. The seal plate as defined by claim 24 wherein said fluid
guidance plug includes a projection extending from each one of said
faces of said body member for engagement with the hubs.
30. The seal plate as defined by claim 29 wherein said projection
is removably housed within said hydraulic line bore by radially
extending fins at the inlet and outlet of said hydraulic line bore,
a portion of said fins being housed within said first annular
grooves.
31. The seal plate as defined by claim 24 wherein said metal
sealing members include metal annular seal rings having a V-shaped
cross section, the apex of said V-shape engaging the hubs and the
legs of said V-shape engaging said body member; and including
means for permitting fluid flow beneath one leg of one of said
metal annular seal rings from the corresponding one of said
hydraulic line bores.
32. A seal plate for sealingly engaging two opposing hubs, the hubs
having at least one flow bore and at least one hydraulic line bore
therethrough, comprising:
a disc-like metal body member having flangeless faces and a
diameter substantially larger than its thickness;
a flowline port through said body member for each of the flow bores
of the opposing hubs for providing fluid communication
therebetween;
first annular grooves disposed in each face of said body member and
circumscribing the inlet and outlet of said flowline ports;
first metal sealing members housed in said first annular grooves
for sealingly engaging the hubs and said body member;
second annular grooves disposed in each face of said body member
and circumscribing said first annular grooves;
third annular grooves disposed in each face of said body member and
circumscribing said second annular grooves;
first elastomeric sealing members housed in said third annular
grooves for sealingly engaging the hubs and said body member;
a first test port communicating with said second annular grooves
for transmitting pressure fluids to said second annular grooves to
test said first metal sealing members and said first elastomeric
sealing members for leakage;
a hydraulic control line bore through said body member for each of
the hydraulic line bores in the hubs to provide fluid communication
therebetween;
fourth annular grooves disposed in each face of said body member
and circumscribing the inlet and outlet of said hydraulic control
line bores;
second metal sealing members housed in said fourth annular grooves
for sealingly engaging the hubs and said body member;
at least two alignment bores extending through said body
member;
fifth annular grooves disposed in each face of said body member
passing through the inlet and outlet of the outermost of said
hydraulic control line bores and circumscribing any other of said
hydraulic control line bores;
a second test port communicating with said fifth annular grooves
for transmitting test fluids to said fifth annular grooves to
distribute said test fluids on the faces of said body member;
sixth annular grooves disposed at the periphery and in each face of
said body member and circumscribing all of said flowline ports and
hydraulic control line bores;
second elastomeric sealing members housed in said sixth annular
grooves for sealingly engaging the hubs and said body member;
and
fluid guidance plugs disposed in at least one of said hydraulic
control line bores for controlling fluid flow therethrough.
33. The seal plate as defined by claim 32 where the hubs have a
plurality of flow bores and hydraulic line bores therethrough, and
further including:
first communication passages connecting adjacent second annular
grooves in each face of said body member;
second communication passages through said body member connecting
said adjacent second annular grooves in said one face with said
second annular grooves in the other face of said body member;
and
said first test port being in flow communication with said first
and second communication passages to pass pressure fluids to said
second annular grooves.
34. The seal plate as defined by claim 32 where the hubs have a
plurality of flow bores and hydraulic line bores therethrough, and
further including first and second arcuate channels in the
periphery of said body member; said first and second test ports
being disposed in said first and second arcuate channels,
respectively.
35. The seal plate as defined by claim 32 wherein said first and
second metal sealing members include metal annular seal rings
having a V-shaped cross section, the apex of said V-shape engaging
the hubs and the legs of said V-shape engaging said body member;
and including
a first set of diametrically opposed channels extending from the
bottom of said first annular grooves to said flowline ports for
permitting fluid flow underneath said legs of said metal annular
seal rings in said first annular grooves; and
a second set of diametrically opposed channels extending from the
bottom of said fourth annular grooves to said hydraulic control
line bores for permitting fluid flow underneath said annular metal
seal rings in said fourth annular grooves.
36. The seal plate as defined by claim 32 wherein said second metal
sealing members include metal annular seal rings having a V-shaped
cross section with the legs of said V-shape engaging the bottom of
said fourth annular grooves, and including an annular ring disposed
within said fourth annular grooves and circumscribing said
hydraulic control line bores and making line contact with the
innermost leg of said metal annular seal rings.
37. A connection for sealingly connecting fluid carrying pipes for
transporting liquids comprising:
two hubs aligned opposite one another each having at least one port
connected to at least one such fluid carrying pipe and at least one
hydraulic line bore therethrough;
valve means housed within at least one of said ports for sealingly
closing off such fluid carrying pipes;
a seal plate disposed between said opposing hubs, said seal plate
comprising:
a disc-like metal body member having flangeless faces and a
diameter substantially larger than its thickness;
a flowline port through said body member for each of the ports of
the opposing hubs for providing fluid communication
therebetween;
first annular grooves disposed in each face of said body member and
circumscribing the inlet and outlet of said flowline ports;
first metal sealing members housed in said first annular grooves
for sealingly engaging the hubs and said body member;
second annular grooves disposed in each face of said body member
and circumscribing said first annular grooves;
third annular grooves disposed in each face of said body member and
circumscribing said second annular grooves;
first elastomeric sealing members housed in said third annular
grooves for sealingly engaging the hubs and said body member;
a first test port communicating with said second annular grooves
for transmitting pressure fluids to said second annular grooves to
test said first metal sealing members and said first elastomeric
sealing members for leakage;
a hydraulic control line bore through said body member for each of
the hydraulic line bores in the hubs to provide fluid communication
therebetween;
fourth annular grooves disposed in each face of said body member
and circumscribing the inlet and outlet of said hydraulic control
line bores;
second metal sealing members housed in said fourth annular grooves
for sealingly engaging the hubs and said body member;
at least two alignment bores extending through said body
member;
fifth annular grooves disposed in each face of said body member
passing through the inlet and outlet of the outermost of said
hydraulic control line bores and circumscribing any other of said
hydraulic control line bores;
a second test port communicating with said fifth annular grooves
for transmitting test fluids to said fifth annular grooves to
distribute said test fluids on the faces of said body member;
sixth annular grooves disposed at the periphery and in each face of
said body member and circumscribing all of said flowline ports and
hydraulic control line bores;
second elastomeric sealing members housed in said sixth annular
grooves for sealingly engaging the hubs and said body member;
fluid guidance plugs disposed in at least one of said hydraulic
control line bores for controlling fluid flow therethrough; and
means for joining together said opposing hubs with said seal plate
therebetween.
38. A seal plate for sealingly engaging two opposing hubs having a
plurality of hydraulic lines therethrough, comprising:
a disc-like metal body member having flangeless faces and a
diameter substantially larger than its thickness;
at least one hydraulic line bore through said body member in
alignment with a hydraulic line in each of said hubs for permitting
fluid passage between the hubs;
a fluid guidance member housed in said hydraulic line bore for
guiding fluid flow through said body member;
a transverse channel within said body member communicating with
said hydraulic line bore;
a blind bore through one face of said body member but not extending
all the way through said body member, said blind bore communicating
with said transverse channel; and
a fluid channel in said body member extending from the periphery of
said body member to said blind bore whereby fluids can flow from
the periphery of said body member to said hydraulic line bore.
Description
TECHNICAL FIELD
This invention relates to flowline and hydraulic control line
connections wherein two or more such lines must be sealingly
connected with one another. More particularly, it relates to
underwater connectors for connecting flowline and hydraulic control
lines, sealing the connection, testing the connection and rerouting
the fluid flow within the connection.
BACKGROUND ART
Originally offshore oil and gas wells were completed on platforms
resting on the ocean bottom, or were completed on the bottom with
surface production facilities installed on such a platform. Oil and
gas produced at such platforms were either collected by tankers or
by flowlines laid on the bottom. To the extent that underwater work
was required, it was performed by divers, by submarines, or by
simple manipulations from the surface.
More recently it has become necessary to drill oil and gas wells in
water which is too deep or too dangerous for convenient underwater
operations by divers or for platforms standing on the bottom. It
has thus become necessary to devise methods of connecting subsea
oil and gas wells at the ocean floor with flowlines, hydraulic
control lines and electrical cables extending to the surface
without the use of divers or any permanent surface structure
adjacent the underwater well. Various devices have been proposed
for achieving such underwater connections, as shown for example in
U.S. Pat. Nos. 3,968,838 to Baugh, 4,019,334 to Sinclair, et al,
and 4,086,778 to Latham, et al. A better understanding of the
problems presented may be obtained by reference to the January 1978
issue of Offshore Services magazine, published by Spearhead
Publications Limited, at pages 26-51.
In connecting, by remote operation, flowlines and hydraulic lines
to an underwater production unit, it is essential to insure that
the connection is properly sealed. One or more of the hubs or ends
of the lines may become damaged during their descent to the ocean
bottom, travel along the ocean floor, and pulling onto the
production unit for connection thereto. Such damage may prevent
sealing engagement with the hub on the production unit.
In the past clamp connectors for underwater flowline assemblies,
such as the one disclosed in applicants' own prior patent, U.S.
Pat. No. 3,843,168 to Morrill, et al, have not used seal plates
between the hubs but merely clamped the hub faces together to
achieve fluidtight engagement. Hence, the hub alignment is critical
prior to clamping and sometimes the connection could not be tested
hydraulically before full flow conditions are established. Other
connections include elongated spool pieces, such as the one
disclosed in U.S. Pat. No. 4,019,334 to Sinclair, et al, which
require two clamps or sets of bolted flanges, one at each end of
the spool piece, to establish a fluidtight connection.
Prior art connections require direct end-to-end alignment between
mating flowline and hydraulic control line ends and do not permit
fluid interconnection between one line and any other line not
directly aligned with each other without physically rearranging or
realigning the lines within the connection.
The present invention overcomes the deficiencies of the prior art
by providing a seal plate between the ends of lines in the
connection. The seal plate eliminates critical hub alignment,
provides improved sealing, permits testing of the connection and
allows rerouting of flow between the various lines. Other objects
and advantages of the present invention will appear from the
following description.
DISCLOSURE OF THE INVENTION
The seal plate of the present invention includes a metal body
member, ears integral with the body member, flowline ports and
hydraulic line bores through the body member, seals mounted around
the ports and bores, transverse passages between certain hydraulic
line bores, throughbores for alignment pins and test passages
within the body member. The metal body member is a few inches thick
and has a shape generally conforming to the shapes of the flowline
hubs. The diameter of the body member is preferably on the order of
6 to 7 times larger than the thickness of the body member. The
throughbores receive alignment pins engaging the flowline hubs for
matingly engaging and aligning the flowlines, hydraulic lines, the
flowline flow ports, and hydraulic line bores. The test passages
within the metal body member terminate in fluid test ports through
which a pressure test of the seals may be carried out after the
connection is made. The hydraulic line bores through the body
member are adapted to receive stop plugs or protruding center pins
with means for fluid flow around them to permit fluid flow through
said hydraulic line bores. The hydraulic lines terminating within
the hubs are sealed off at the hub face through check valves
mounted within the apertures in the hubs for each hydraulic line.
When the connection is made, the protruding center pin within the
hydraulic line bore of the seal plate will push open the check
valve within the hydraulic line aperture of the hub. If a flush
stop plug rather than a protruding pin is mounted within a
hydraulic line bore of the seal plate, the corresponding hydraulic
line will not be opened but remain blocked off from fluid flow.
The seals, carried by the seal plate of the present invention,
include metal V-seals around each flowline port and control line
bore, conventional O-rings around the metal V-seals surrounding the
flowline ports, and conventional O-rings around the periphery of
the seal plate. The seal plate is also equipped with hydraulic test
ports inside the peripheral O-ring to test the seals after
clamp-up. No seals or seal grooves are required on the flowline
hubs.
The seal plate may be changed to block selected hydraulic lines
within the connection. In addition, internal transverse channels
are cut within the seal plate itself permitting fluid communication
between certain hydraulic control lines. These transverse channels
within the seal plate may be employed to reroute fluid flow between
various lines and even reverse the flow altogether within the seal
plate.
BRIEF DESCRIPTION OF THE DRAWINGS
For a detailed description of a preferred embodiment of the
invention, reference will now be made to the accompanying drawings
wherein:
FIG. 1 is a schematic view showing the environment of the invention
including a connecting tool for remotely connecting the mating
faces of subsea flowline and hydraulic line hubs;
FIG. 2 is an elevation view, partly in section, of the clamp
connector with the seal plate mounted between the clamp halves;
FIG. 3 is a side view of the clamp connector and seal plate of FIG.
2;
FIG. 4 is a top view of the clamp connector and seal plate of FIG.
2;
FIG. 5 is an elevation view of a flowline seal plate for both
flowlines and hydraulic lines;
FIGS. 6 and 7 are cross-sectional views of the seal plate of FIG.
5, taken along lines 6--6 and 7--7, respectively;
FIG. 8 is a front view of a flowline hub with flowline flow ports
and hydraulic line bores;
FIG. 9 is a side section view of the flowline hub of FIG. 8;
FIG. 10 is a sectional view of a metal V-seal ring surrounding one
of the flowline flow ports or hydraulic line bores;
FIG. 11 is a sectional view of one of the check valves disposed
within the hydraulic control lines;
FIG. 12 is a sectional cut-away of one of the hydraulic fluid test
valves used for testing the seal plate for leakage after clamping
engagement;
FIG. 13 is an elevation view of a seal plate for hydraulic lines
only;
FIG. 14 is a cross-sectional view of the seal plate of FIG. 13,
taken at line 14--14 of FIG. 13;
FIG. 15 is a sectional view of the seal plate of FIG. 13 with two
hydraulic line hubs having fluid diverter plugs; and
FIGS. 16 and 17 are partial sectional views of different fluid
guidance plugs of the type shown in FIG. 15.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring first to FIG. 1, there is illustrated an environment of
the present invention for connecting underwater flowlines and
hydraulic lines to flowlines and hydraulic lines extending to the
surface. Details of the environment are described in patent
applications Ser. Nos. 973,619 filed Dec. 27, 1978 now U.S. Pat.
No. 4,329,085 and 973,895, filed Dec. 28, 1978, abandoned in favor
of application Ser. No. 283,094, filed July 13, 1981, now U.S. Pat.
No. 4,382,717, which are incorporated herein by reference. A
portion of an underwater manifold center, shown as production unit
10, gathers oil and gas produced from one or more wells and
transfers the produced oil and gas to a central location.
Production unit 10, as shown in FIG. 1, includes a Christmas tree
(not shown) that has been landed on the base 12 having been guided
into position. One or more flowlines, such as flowlines 22, 24 for
transporting the oil or gas, and hydraulic control lines 26
terminate at an inboard hub 20 mounted on production unit 10. When
it becomes desirable to transport the oil and gas from production
unit 10 to the surface, it becomes necessary to lay underwater
pipelines or flowlines extending to the surface and to connect such
flowlines and hydraulic control lines to inboard hub 20. The
present invention includes apparatus useful in achieving this
underwater connection.
As disclosed in U.S. Pat. Nos. 4,329,085 and 4,382,717, a floating
vessel has drill pipe (not shown) and various guidelines 14
extending downwardly therefrom to underwater production unit 10. A
pipe laying barge, such as is well known in the art, is used to lay
underwater pipelines or flowlines for oil and gas. The barge has
depending therefrom an outboard hub 30 connected to flowlines 32,
34 and one or more hydraulic control lines 36 for mating connection
to inboard hub 20 with inboard flowlines 22, 24 and hydraulic
control lines 26. To achieve the mating connection between inboard
hub 20 and outboard hub 30, the floating vessel has a pull-in tool
(now shown) which is lowered onto production unit 10 to pull, by
means of a cable, a flowline bundle housing outboard hub 30 from
the pipe laying barge to production unit 10. Upon proper alignment
of hub 30 and the securement of said flowline bundle on production
unit 10, the pull-in tool is retrieved.
Referring again to FIG. 1, a hub connector tool, generally
indicated at 16, carrying a clamp 40 and seal plate 50 is lowered
from the vessel along guide cable 14 and landed on base 12. Tool 16
is guided onto the base 12 by funnel 18 engaging base structure
guide posts 28 and tool hub yokes engaging inboard and outboard
hubs. Inboard hub 20, even though mounted on base 12, is
horizontally slideable, such movement being permitted by the
flexibility of flowlines 22, 24 and hydraulic control lines 26.
The underwater flowline and hydraulic control line connection of
the present invention connects hubs 20 and 30 to achieve fluid
communication between flowlines 22, 24 and hydraulic control lines
26 with flowlines 32, 34 and hydraulic control lines 36
respectively. The connection is accomplished using clamp 40 to
clamp seal plate 50 between hubs 20 and 30 with guidance plugs 150
(shown in FIG. 6) and check valves 110 (shown in FIG. 11) housed
therewithin.
The means for making the connection may be of the type shown in
U.S. Pat. No. 3,843,168 issued Oct. 22, 1974, entitled "Clamp
Connectors". Such a connector means is illustrated in part in FIGS.
2, 3, and 4 and includes a pair of plates 42, 44 supporting an
upper and lower clamp half 46, 48 with seal plate 50 being
suspended by plate 44 between clamp halves 46, 48. Clamp halves,
46, 48 are threadingly disposed between plates 42, 44 on screws 52,
54 whereby as screws 52, 54 are energized, clamp halves 46, 48
close around seal plate 50 and hubs 20, 30.
It can be appreciated that the seal plate and related connection
may be used for connecting flowlines, hydraulic control lines,
electrical connections, other types of control lines, and
combinations thereof. Although seal plate 50 is shown adapted to
connect hubs 20 and 30 having both flowlines and hydraulic control
lines, a seal plate for connecting only hydraulic control lines
will be described later.
Referring now to FIGS. 2, 5, 6 and 7, seal plate 50 used with hubs
20, 30 includes a flangeless disc-like body member 56,
approximately 21/2 inches thick and made of steel, having a
generally circular shape conforming to hubs 20, 30. Body member 56
has a diameter of approximately 18 inches and has two diametrically
opposed holding ears 58, 60 having rectangular slots 62 for
receiving the edges of plate 44 to mount seal plate 50 on the
connector tool 16.
Two holes 64 through body member 56 are located adjacent holding
ears 58, 60 to receive two dowel pins 66 (shown in FIGS 2 and 4).
Dowel pins 66 fit tightly within holes 64 to secure them to seal
plate 50. Hubs 20, 30 have apertures 68 to receive pins 66 upon
final connection. Aperture 68 of hub 30 is shown in FIGS. 8 and 9.
Dowel pins 66 provide a final alignment of hubs 20, 30 and seal
plate 50 prior to clamping them together.
Referring to FIGS. 5 and 7, body member 56 of seal plate 50 further
includes two flowline ports 70, 72 adapted for alignment with
flowline passageways 80, 82 as illustrated in FIG. 9 in hubs 20, 30
connected to flowlines 22, 24 and 32, 34 respectively. As shown in
FIG. 7, the flowline ports 70, 72 of seal plate 50 are encircled by
metal V-seals 90 such as the ones disclosed in U.S. Pat. No.
3,637,223 to Weber, which are housed in annular grooves 92 on each
face of seal plate 50. V-seals 90 contact the face of hubs 20, 30
upon make up of the connection to provide a sealing connection
around the flowline ports 70, 72 and passageways 80, 82. O-rings
170 and 172 are housed in annular grooves in both faces of seal
plate 50 to provide a test seal around flowline ports 70, 72
respectively.
Referring now to FIGS. 5 and 6, body member 56 also includes
sixteen hydraulic control line bores 100 positioned for alignment
with hydraulic control line orifices 102 (shown in phantom lines in
FIG. 8) in hubs 20, 30 communicating with hydraulic control lines
26 and 36 respectively. As shown in FIGS. 6 and 10, metal V-seals
90 also surround hydraulic control line bores 100 in annular
grooves 94 located in each face of seal plate 50 and contact the
faces of hubs 20, 30 upon make up for sealing around bores 100 and
orifices 102 (shown in FIG. 8).
As shown in FIG. 5, O-rings 174 are housed in annular grooves
around the periphery of both faces of seal plate 50 around all of
the flowline ports 70, 72 and hydraulic control line bores 100 for
testing purposes. Thus all seals are carried by seal plate 50
permitting hubs 20, 30 to be free of any seals or seal grooves on
their faces.
Referring now to FIG. 10 for a discussion of the V-seals 90, the
V-seals 90 on both sides of the seal plate 50 have their apex 96
extending away from the face of the seal plate 50 such that, when
clamped together, their legs 98, 99 are slightly depressed forming
a fluidtight seal between the faces of plate 50 and hubs 20, 30.
Each hydraulic control line bore 100 is provided with two
diametrically opposed channels 104, 106 extending from the
perimeter of bores 100 into V-seal groove 94. The function of
channels 104, 106 is best illustrated with reference to FIG. 10. In
the absence of channels 104, 106 fluid pressure from within bore
100 might conceivably establish sealing contacts, pressure transfer
and deformation along leg 99 of V-seal 90. Channels 104, 106,
however, permit fluid flow underneath leg 99 and into the
triangular center portion 108 of V-seal 90 thereby equalizing the
pressure on both sides of inner leg 99 of V-seal 90. Thus, the
desired pressure seal is established along the outer leg 98 of
V-seal 90.
Referring now to FIGS. 8 and 11, check valves 110 are disposed in
each of the hydraulic control line orifices 102 to control fluid
flow therethrough. As shown in FIG. 11, valve 110 includes a
tubular housing 112 having a valve seat 114 in one end and a
closure ring 116 in the other. A tubular valve rod 118 is disposed
within the chamber 120 of housing 112 and has a tapered head 122
adjacent valve seat 114. A connection 124 on the other end of rod
118 protrudes outside of housing 112 having a center channel 144
for fluid communication between chamber 120 and hydraulic control
line orifice 102. A spring 126 is biased between an annular
shoulder 128 created by head 122 and the internal end 130 of
closure ring 116. Valve rod 118 has an internal chamber 132 and
ports 134 to permit fluid to flow into chamber 132. Head 122 has a
contact pin 136 threaded into its outer end. Valve rod 118 includes
a slot 138 which slideably receives a stop pin 140 protruding from
the inner wall of housing 112 and into chamber 120. Pin 140 limits
the travel of valve rod 118 within chamber 120. Closure ring 116
has an annular ring 142 to be bolted against an internal shoulder
(not shown) within the hydraulic control line orifice 102.
Referring again to FIG. 6, each hydraulic control line bore 100 may
function to provide a throughbore for fluid flow, block fluid flow,
or permit a pressure tap into the bore. Where a throughbore such as
bore 100A shown in FIG. 6 is used to provide for a straight
connection between the mating hydraulic control lines 26, 36 of
hubs 20, 30, a fluid guidance plug 150 is disposed within the
hydraulic control line bore. Fluid guidance plug 150 consists of
center pin 152 protruding beyond the faces of seal plate 50 when
fully inserted in bore 100A and fins 154 extending across that same
bore opening 100A which abut a raised shoulder 105 within grooves
94. Fluid guidance plugs 150 are either flush with, or extend
beyond, the faces of seal plate 50.
Referring to FIG. 8, hydraulic control line orifices 102 within
hubs 20, 30 are all equipped with check valves 110 which seal off
the hydraulic control lines 26, 36 unless the check valve 110 is
depressed and opened by one of the fluid guidance plugs 150.
Alternatively, if a guidance plug 150 has been chosen which is
flush with the surface of plate 50, the check valve 110 inside the
control line of the hub will remain closed even after seal plate 50
and hubs 20, 30 are clamped together. In operation upon engagement
with seal plate 50 and the application of clamp 40, the protruding
end of the hydraulic line fluid guidance pin 150 within the seal
plate throughbore 100 engages head 122 and depresses spring 126
permitting fluid communication between the seal plate valve seat
114 and exit connection 124 from internal channel 132. Stop pin 140
provides a safety stop for restricting the maximum travel of check
valve rod 118 under depression of spring 126.
Referring again to FIGS. 5-7, seal plate 50 has several means for
remote sensing and testing of the hydraulic line V-seals 90 for
leakage. A generally rectangular channel 160 adjacent holding ear
60 is cut along the perimeter of seal plate 50 and a second channel
162 at the top of seal plate 50 is also cut along the perimeter.
Hydraulic test lines such as those shown in phantom lines in FIG. 2
are laid within these channels 160, 162, respectively, which are
connected to pressure reservoirs (not shown) at one end and to test
ports 164, 166 adjacent channels 160, 162 respectively, at the seal
plate end thereof. Test port 164 is located between O-rings 174 and
170, 172. The V-seal grooves 94 of throughbores 100, as well as
dowel pin throughbores 64, are connected by means of a semicircular
groove 168. Test port 164 is situated within semicircular groove
168 along which the test fluid is distributed throughout the
surface of seal plate 50. Test port 166 is positioned inside O-ring
170 and terminates within semicircular groove 171. A similar groove
173 around flowline 72 is connected to test port groove 171 by
means of connector bores 180 terminating in center bore 182 which
in turn is sealed off against liquid loss by plug 184 (shown in
FIG. 7). Through this arrangement, a static test pressure may be
applied through test port 166 inside both flowline O-rings 170 and
172 which may thus be tested against leakage separate and apart
from static pressure tests applied to O-ring 174 through test port
164.
Referring now to FIGS. 2, 3, and 4, seal plate 50 is depicted as
being suspended between the clamp halves 46, 48 by plate 44 on ears
58. 60. A test port valve 190 is carried in guide pin receiving
sleeves 192 which are attached between plates 42, 44, e.g., by
welding. Test port valves 190, as illustrated in FIG. 12, are
closed by a spring loaded stop 194 biased against shoulder 196
until the guide pin (not shown) on the connector tool 16 receiving
structure of the subsea assembly depresses spring 198 and opens
fluid communications between the hydraulic test fluid reservoir
(not shown) and test line 195.
Referring now to FIGS. 13 and 14, a seal plate 250 is shown for
connecting hubs containing only hydraulic control line bores 300.
In the proximity of holding ears 358, 360, but inside O-ring 374,
are located two dowel holes 264. Hydraulic bores 300 through seal
plate 250 may function either as direct fluid communication
channels between the control line ends, or as means to provide a
pressure tap in any given line, or, lastly, as interconnected bores
to reroute fluid flow in any desired fashion.
Referring now to FIG. 15, fluid guidance plugs 350 are positioned
within hydraulic line bores 300A and 300B. Such fluid guidance
plugs consists of center pin 352 having one end 353 protruding
beyond the surface of seal plate 250 when fully inserted in bore
300A, fins 354 extending across that same bore opening 300A which
abut a raised shoulder 305 within channel 394 and a circular stop
plug 400 sealing off bore opening 300A at the other end of the pin
352. Stop plug 400 in turn is sealed around its periphery against
fluid escaping along the walls of channel 300A by an O-ring 402
positioned within annular groove 404.
As shown in FIG. 15, hydraulic lines 406, 408, 410 and 412 within
the hubs are equipped with check valves 310 which seal off
hydraulic control lines 406, 408, 410 and 412 against loss of
hydraulic fluid when not connected to seal plate 250. As the clamp
halves pull the hubs toward each other the protruding end of stop
pin 352 pushes open check valve 310A, thereby enabling hydraulic
fluid to pass between fins 354 and to enter bore 300. Within seal
plate 250 a number of transverse bores, e.g., 420, connect the
various bores 300. Such transverse bores drilled inside seal plate
250 are sealed at the periphery by tapered plugs, such as 422. By
positioning another stop plug 400 of the type just described above
in bore 300B connected to bore 300A by transverse bore 420, fluid
communication between the two bores may be arranged in two
different ways. Positioning stop plug 400 in the manner shown in
FIG. 15, i.e., such that protruding pins 353 in bores 300A and 300B
extend away from that side of seal plate 250 which abuts hydraulic
line 410, 408, respectively, the check valves 310 within the
hydraulic lines will be pushed open so as to connect lines 408 and
410 in the fashion indicated in FIG. 15.
By reversing stop plug 400 in bore 300B, however, its sealed off
end will close off line 408 from line 410 and the protruding end
353 of pin 352 will, in that position, open up the check valve 310
within flowline 412, thus effectively reversing the fluid flow at
the seal plate by rerouting all liquid coming in from line 410 to
return through 412.
Two other variations of the fluid guidance plugs 350 shown in FIG.
15 are contemplated within the seal plates of the present invention
and are shown in FIGS. 16 and 17. Through-line plug 430 in FIG. 16
has both ends of center pin assembly 352 protruding beyond the face
of seal plate 250. It is also provided with fin connectors 354,
similar to the ones described above, at both ends of the fluid
bore, e.g., bore 300. When employed between two hydraulic fluid
line hubs, each sealed off by check valves 310 as described above,
the protruding ends 353A and 353B of pin 352 will open both check
valves 310 and the fins 354 will permit straight-line fluid
connections through seal plate 250.
Instead of sealing off one end of a real throughbore such as bores
300, a valve opener or fluid guidance plug 440 may also be employed
in another type of seal plate port, such as channel 442 in FIG. 17
which does not extend all the way through seal plate 250, but does
provide interconnection with other fluid bores through internal
channels within seal plate 250. In that embodiment, one end of
protruding pin 352 is pressed against a center bore 444 within the
fluid channel 442. Connector fins 354 abutting shoulders 305 permit
fluid flow from the check valve 310 within the hydraulic line of
the hub, once opened by protruding end 353 of pin 352, to enter
channel 442 which does not extend straight through seal plate 250,
but is connected to other flow ports of seal plate 250 via internal
seal plate channels (not shown in the sectional plane of FIG. 17)
which terminate at semi-bore 442.
Lastly, hydraulic control lines may also be sealed off completely
by not providing a throughbore at their seal plate terminus. Of the
six hydraulic line seal ports of seal plate 250, for example, ports
301 are blind ports, as shown in FIGS. 13 and 14. They may be used,
for example, to put a pressure tap in the corresponding hydraulic
line. As shown in more detail in FIG. 13, the hydraulic lines
ending at blind ports 301 of seal plate 250 abut V-seal channels
394, and, their internal check valves 310 not being opened by a
corresponding pin 352, remain effectively sealed against any fluid
loss by both the internal check valves 310 and the V-seals 290 of
blind ports 301 on the seal plate itself. Once again, an outer
O-ring 374 and a test port 364 within semicircular test groove 133
permit the application of a test pressure on each surface of seal
plate 250 to check the clamp application and the O-ring seal 374
for fluid tightness. As described above, all V-seal channels 394 in
both blind and fluid communicable ports are equipped with pressure
equalization grooves 304, 306. Test port hydraulic connection line
395 is again run in along a channel cut within the perimeter of the
disk and extending through one of the holding ears 360 to clamp
half 46. In this particular embodiment, only one test port 364, one
test port line 395 and one test port valve 190 are needed in the
absence of the two main flowlines.
The diverless tree connection system for subsea template production
units within which the seal plate of the present invention is to be
employed is characterized by the fact that no hydraulic equipment
is left on the sea bottom to maintain the integrity of the joint
and that all of the tools are retrieved for further use on other
installations. This system recommends itself through its simplicity
of design, the economics of its operation and the ease and speed of
the connection and disconnection features. The diverless connection
system is utilized where the wellhead or tree flowlines and the
hydraulic control lines with protective covers on the exposed hubs,
are already laid to the well site and the other flowline hub with
its inferfacing flowlines and service lines lies, similarly
protected by a frontal cover plate, correctly aligned in a position
which still permits one of them slight lateral movement. On the
surface, a connector tool is attached to the guide wires and is run
down to a position above the interfacing hub members. The hub cover
plates are pushed downward by the bottom half of the clamp so that
it now straddles the connection underneath the two hubs with its
mating half stationed directly above and already engaged with the
clamping screws. During that process a guide pin on the connector
tool opens up the test port valve by depressing its spring loaded
valve stop. The hydraulic rams between the hub yokes are then
actuated and the flowline hubs drawn into the mating engagement.
The clamping motors are energized and the two screws close the two
halves until a predetermined clamping load is reached and the
connection is made. During that process the metal V-seals
surrounding all flowline and throughbore ports are depressed so as
to be sealingly seated against the hub faces. At the same time the
protruding pins of the fluid guidance plugs housed within the seal
plate throughbores open up the check valves positioned within the
hydraulic control line ends inside the hubs. The O-ring seals may
now be tested for pressure loss and if there are no leaks the
connector tool is run back to the surface, leaving the joint made
up and no equipment on the seabed. Thereafter fluid flow through
the flow lines or through the hydraulic control lines may be
started up and normal operations begin.
Seal plates can be disengaged again and exchanged for differently
configurated plates by lowering the clamp connector tool and
reversing the clamp locking steps previously described. In this
fashion fluid flow among various hydraulic lines may be rerouted by
inserting seal plates having different internal channels and
different guidance plug configurations.
Various other embodiments and modifications will also be apparent
from the foregoing description. The invention is therefore not
limited to the specific embodiments disclosed, but extends to every
embodiment within the scope of the appended claims.
* * * * *